WO2006052073A2 - Moteur a entrainement direct pour machine a laver - Google Patents

Moteur a entrainement direct pour machine a laver Download PDF

Info

Publication number
WO2006052073A2
WO2006052073A2 PCT/KR2005/003764 KR2005003764W WO2006052073A2 WO 2006052073 A2 WO2006052073 A2 WO 2006052073A2 KR 2005003764 W KR2005003764 W KR 2005003764W WO 2006052073 A2 WO2006052073 A2 WO 2006052073A2
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
connector
direct drive
washing shaft
drive motor
Prior art date
Application number
PCT/KR2005/003764
Other languages
English (en)
Other versions
WO2006052073A3 (fr
Inventor
Hyeok Deok Kim
Young Su Jung
Original Assignee
Lg Electronics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020040090810A external-priority patent/KR101100168B1/ko
Priority claimed from KR1020040095071A external-priority patent/KR101100180B1/ko
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to EP05825777.5A priority Critical patent/EP1810387B1/fr
Priority to US10/562,670 priority patent/US7755228B2/en
Priority to CN2005800457980A priority patent/CN101443983B/zh
Publication of WO2006052073A2 publication Critical patent/WO2006052073A2/fr
Publication of WO2006052073A3 publication Critical patent/WO2006052073A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders

Definitions

  • the present invention relates to washing machines, and more particularly, to a direct drive motor applicable to a drum type washing machine, and the like.
  • a pulsator type washing machine performs washing under the control of a microcomputer for removing dirt from clothes, and beddings by using a softening action of detergent, friction of water circulation following rotation of a pulsator, and impact of the pulsator to laundry, after kind and amount of laundry is detected with a sensor, to set a washing method automatically accordingly, and washing water is supplied to a proper level according to the kind and amount of the laundry.
  • the drum type washing machine washing laundry by using friction between laundry and drum rotated by driving force of a motor in a state the detergent, washing water, and the laundry are introduced into the drum, gives almost no damage to the laundry, causes no entangling of the laundry, and provides a washing effect of pounding and rubbing the laundry.
  • FIG. 1 illustrates a longitudinal section of a related art drum type washing machine, provided with a tub 2 in a cabinet 1, and a drum 3 rotatably mounted at a central portion of the tub 2.
  • the related art washing machine has the following drawback since the related are washing machine has a structure in which the driving force is transmitted from the motor 5a to the drum 3 through the motor pulley 18, the drum pulley 19, and the belt 20 connecting the motor pulley 18 and the drum pulley 19.
  • tub 2 of stainless steel of the related art drum type washing machine costs high, has a poor processability, and is heavy.
  • the bearing housing is required to have an inner collar and an outer collar which are separate components for supporting the bearing mounted therein, and fabrication of the rotor is very difficult because of individual permanent magnets, steel plate, and a back yoke at a back side of the steel plate.
  • the direct drive drum type washing machine is liable to insulation between a winding portion of the stator and the rotor broken to cause a current to flow to the washing water in the tub, and has a problem in that the separate fabrication and mounting of the connector for transmission of rotation from the rotor to the washing shaft drops processability in an assembly line and productivity. Disclosure of Invention Technical Problem
  • An object of the present invention is to provide a direct drive motor in a washing machine, in which a structure of a driving unit in a drum type washing machine is improved such that a driving force is transmitted from the motor to the drum directly, for reducing noise, fault, and factors of energy waste, and current flow down to the washing shaft is cut off even if the insulation between the winding portion of the stator and the rotor is broken, for preventing accidents caused by negligence of safety from taking place.
  • Another object of the present invention is to provide a direct drive motor in a washing machine, in which separate mounting of a connector is not required in fabrication of the rotor, to improve productivity and safety.
  • the object of the present invention can be achieved by providing a direct drive motor in a washing machine including a stator 14 having a winding portion with coils wound thereon, a rotor 13 fixedly connected to a washing shaft 4 for direct drive of a drum, the rotor 13 having a side wall 13b, and a rear wall 13a with a pass through hole 131 at a center, and a connector 16 of a material having a vibration mode different from the washing shaft, insert molded at the center of the rear wall 13a of the rotor to form one body with the rotor, and fixedly connected to the washing shaft to connect the rotor to the washing shaft, and support the washing shaft.
  • the rotor 13 is constructed of steel plate by pressing to form the side wall 13b and the rear wall 13a as one body.
  • the pass through hole 131 at a center of the rear wall 13a of the rotor 13 is formed at a center of a hub 132 which is a portion projected in a stator side or in a direction opposite thereto with respect to neighboring surface.
  • the connector 16 is formed of resin for insulating between the washing shaft 4 and the rotor 4 even if the washing shaft 4 is formed of metal, which is conductive to electricity.
  • the connector 16 includes a serration 164 on an inside circumferential surface having a shape in conformity with a shape of a serration 400 at a rear end portion of the washing shaft 4.
  • the connector 16 further includes reinforcing ribs 161 for reinforcing strength of the connector 16.
  • the rotor 13 includes at least one communication hole in a neighborhood of the pass through hole 131 for enhancing bonding force between the connector 16 of resin and the rotor at the time of insert molding of the connector, for firm bonding between the rotor 13 and the connector 16.
  • the connector 16 may be insert molded in the rotor such that the connector 16 covers an inside of the pass through hole 131 and front and rear surfaces of neighborhood of the pass through hole 131 of the rotor.
  • the pass through hole 131 in the rotor 13 has a bonding piece 210 projected in a length direction of the washing shaft 4 for enhancing bonding force between the connector 16 of resin and the rotor 13 at the time of insert molding of the connector.
  • the rear wall 13b has at least one bonding piece 211 around the pass through hole
  • a direct drive motor in a washing machine includes a stator 14 having a winding portion with coils wound thereon, a rotor 13 fixedly connected to a washing shaft 4 for direct drive of a drum, the rotor 13 having a sidewall 13b, and a rear wall 13a formed as one body by pressing steel plate, with a pass through hole 131 at a center of the rear wall 13 a, and a connector 16 of resin insert molded such that the connector 16 is bonded on inner, and outer sides of the rear wall 13a of the rotor including communication holes 137 therein to form one body with the rotor, and fixedly connected to the washing shaft to connect the rotor to the washing shaft, and support the washing shaft.
  • a direct drive motor in a washing machine includes a stator 14 having a winding portion with coils wound thereon, a rotor 13 of magnetic metal fixedly connected to a washing shaft 4 of metal for direct drive of a drum, the rotor 13 having a sidewall 13b, and a rear wall 13a with a pass through hole 131 at a center, and a connector 16 of resin for insulating between the washing shaft and the rotor, insert molded at the center of the rear wall 13a of the rotor 16 to form one body with the rotor, and connect the washing shaft to the rotor.
  • the direct drive motor in a washing machine of the present invention has the following advantages.
  • the direct drive motor permits to provide a drum type washing machine having less noise, faults, and power loss, and the rotor of steel plate enabling pressing with good processability to require a shorter fabrication time period permits to provide a drum type washing machine having an improved productivity.
  • the connector having a vibration mode different from the rotor permits to reduce vibration from the rotor to the washing shaft, and the resin of the connector insulates between the rotor and the washing shaft even if both the rotor and the washing shaft are formed of metal which is conductive, thereby preventing accidents of electric shock from taking place in advance.
  • FIG. 1 illustrates a diagram of a related art direct drive drum type washing machine, schematically
  • FIG. 2 illustrates a diagram of a direct drive drum type washing machine in accordance with a preferred embodiment of the present invention
  • FIG. 3 illustrates a longitudinal section of "A" part in FIG. 2 showing a driving unit of the drum type washing machine in accordance with a preferred embodiment of the present invention
  • FIG. 4 illustrates an enlarged view of "B" part in FIG. 3;
  • FIG. 5 illustrates a perspective view of the rotor in FIG. 3, with a partial cut away view
  • FIG. 6 illustrates a bottom perspective view of FIG. 5;
  • FIG. 7 illustrates a perspective view of the stator in FIG. 3;
  • FIG. 8 illustrates an enlarged view of a longitudinal section of key parts of a driving unit in a drum type washing machine in accordance with another preferred embodiment of the present invention.
  • FIG. 9 illustrates an enlarged view of a longitudinal section of key parts of a driving unit in a drum type washing machine in accordance with another preferred embodiment of the present invention. Best Mode for Carrying Out the Invention
  • FIG. 2 illustrates a diagram of a direct drive drum type washing machine in accordance with a first preferred embodiment of the present invention
  • FIG. 3 il ⁇ lustrates a diagram showing detail of "A" part in FIG. 2
  • FIG. 4 illustrates an enlarged view of "B" part in FIG. 3.
  • FIG. 5 illustrates a perspective view of the rotor in FIG. 3, with a partial cut away view
  • FIG. 6 illustrates a bottom perspective view of FIG. 5
  • FIG. 7 illustrates a perspective view of the stator in FIG. 3.
  • the drum type washing machine in accordance with the embodiment includes a tub
  • washing shaft 4 connected to the drum 3 for transmission of a driving power from a motor 5 to the drum 3, and bearings on an outside circumferential surface of opposite ends of the washing shaft 4.
  • the tub 2 is formed of plastic, and a bearing housing 7 of metal is provided to a center of a rear wall 200 of the tiib 2 for supporting the bearings on the outside circum ⁇ ferential surface of opposite ends of the washing shaft 4.
  • the metal bearing housing 7 is inserted in injection molding of the plastic tub 2 such that the bearing housing 7 becomes one body with the tub 2 at the rear wall thereof.
  • the bearing housing 7 is formed of aluminum.
  • the bearing housing 7 has steps 8a and 8b on an inside circum ⁇ ferential surface of the bearing housing 7 for supporting a front bearing 6a and a rear bearing 6b, and preventing the bearings from falling off the bearing housing 7, re ⁇ spectively.
  • the step 8a at a front side has a " ⁇ i " shape to form a structure for supporting a rear end of the front bearing 6a
  • the step 8b at the rear side has a " T- " shape to form a structure for supporting a front end of the rear bearing 6b.
  • the washing shaft 4 also has a front end fixedly secured to a spider 10 on the rear wall of the drum 3, a brass bushing 11 press fit on a region of the washing shaft 4 starting from an exposed portion of the washing shaft 4 in rear of the spider 10 to the front bearing 6a for preventing the washing shaft 4 from rusting, and a sealing member 12 on an outer side of the bushing 11 for preventing infiltration of water.
  • the rotor 13 preferably constructed of steel plate, includes a sidewall 13b extended forward from a circumference of a rear wall 13a, having a bent portion formed along a circumferential direction, with a seating surface
  • the rotor 13 is formed by pressing.
  • cooling fins 133 are formed in a radial direction for blowing air toward the stator 14 when the rotor 13 is rotated to cool down heat from the stator 14, each with a predetermined length in the radial direction.
  • the cooling fins 133 are formed by lancing, such that the cooling fins 133 are bent
  • the rotor 13 has a pass through hole 131 at a center of the hub 132, and a connector 16 of resin, having a vibration mode different from the washing shaft 4, is insert molded as one body with the rotor 13 on a periphery of the pass through hole 131.
  • the rotor 13 and the connector 16, fabricated as one body require no more assembly at the time of assembly of the drum type washing machine at the site to improve productivity.
  • a straight portion of the pass through hole 131 is formed in a pass-through direction of the pass through hole 131, i.e., in the same direction of a length direction of the washing shaft actually, in front/rear direction.
  • the connector 16 has a serration 164 on an inside circumferential surface of the hub 163 in conformity with the serration 400 on the rear end of the washing shaft 4, and reinforcing ribs 161 on an outer side of hub 163 of the connector 16 for reinforcing the hub 163.
  • the connector 16 formed of resin having a vibration mode different from the rotor
  • the material of the rotor is not limited to steel plate, but may be other magnetic metal.
  • the washing shaft is also formed of metal, taking strength and pro- cessability into account.
  • the supporter 17 has a front side in close contact with an inner side of a rib 203 on the rear wall 200 of the tib, and a rear side in close contact with an outside cir ⁇ cumference of a rear end of the bearing housing 7, not surrounded by, but exposed from the hub 201 at the center of the rear wall 200 of the tub.
  • a plurality of fastening members 15d are fastened to an inner side of an outside circumferential surface of the supporter 17, and fastened to the hub 204 on the rear wall of the tub.
  • other fastening members 15a are used on an inner side of a circumferential direction of the fastening members 15a.
  • the stator 14 of the motor 5 includes a ring shaped frame 140, and a coil 142 wound on a winding portion on an outer side of the frame 140, with fastening ribs 143 formed on an inner side of the frame 140 as one body for securing the stator 14 to the rear wall 200 of the tub.
  • drum type washing machine having the driving unit of the present invention applied thereto has the following operation.
  • tub 2 of a plastic having a good heat resistance is light and has a good processability as the tub 2 is injection molded.
  • the formation of the bearing housing 7 of a metal, such as an aluminum alloy, enables to apply even to a drum type washing machine having a drying course as the bearing housing 7 has no deformation at a high temperature.
  • the bearing housing of metal inserted in the hub 200 of the rear wall 200 of the tub at the time of injection molding of the tub 2 of plastic so as to be one unit with the tub 2 enables to omit a separate step of mounting the bearing housing 7 on the rear wall of the tub 200.
  • the steps 8a, and 8b on opposite sides of the inside circumferential surface of the bearing housing of metal can support the bearings 6a, and 6b without falling off the bearing housing 7.
  • the positioning steps 9a, and 9b on a front, and a rear outside circum ⁇ ferential surface of the washing shaft 4 mounted in the bearing housing 7 for power transmission from the motor 5 to the drum 3 permits an easy positioning of the front bearing 6a and the rear bearing 6b at the washing shaft 4.
  • the rotor 13 of the direct drive motor 5 is coupled to a center of a rear end portion of the washing shaft 4, and the stator 14 is on an inner side of the rotor 13, wherein the rotor 13 has a sidewall 13b extended forward from a circumference of a rear wall 13a, having a bent portion formed along a circumferential direction, with a seating surface
  • the cooling fins 133 are formed by lancing in a direction of an opened portion of the rotor 13, and the pass through holes 134 formed by the lancing serve as vents.
  • the rotor 13 of steel plate formed preferably by pressing reduces a time period required for fabrication of the rotor 13 significantly, thereby improving productivity.
  • the connector formed as one body with the rotor by the insert molding to omit a step for assembling the connector and the rotor together ad ⁇ ditionally, enables to improve productivity of fabrication of the rotor.
  • the connector 16, formed as one body with the rotor by insert molding thus, with a vibration mode different from the rotor 13 of metal, preferably steel plate, attenuates the vibration from the rotor 13 before transmission of the vibration to the washing shaft 4.
  • the drain hole 136 in the embossed portion 135 enables draining of water.
  • the fastening bosses 202 on an outer side of the hub 201 in a circumferential direction at regular intervals permits to secure the stator 14 to the rear wall 200 of the tub 2.
  • the supporter 17 between the rear wall 200 of the tub 2 and the stator 14, having a shape almost the same with a contour of the rear wall 200 of the tub for securing to the rear wall 200 of the tub at the time of mounting the stator 14 supports, and maintains concentricity of the stator 14.
  • FIG. 8 illustrates an enlarged view of a longitudinal section of key parts of a driving unit in a drum type washing machine in accordance with another preferred embodiment of the present invention.
  • the direct drive motor includes a stator 14 having a winding portion with coils wound thereon, a rotor 13 fixedly connected to a washing shaft 4 for driving a drum directly, having a side wall 13b and a rear wall 13a formed as one body by pressing of steel plate, with a pass through hole 131 at a center of the rear wall, and a connector 16 of resin insert molded with the rotor as one body with the rotor such that the connector 16 is bonded to an inner, and outer sides of the rotor including com ⁇ munication holes 137 in the rear wall 13a of the rotor, and fixedly connected to the washing shaft for connecting the rotor and the washing shaft and supporting the washing shaft.
  • the resin is not only filled in the communication holes 137, but also covers neighborhood of the pass through hole 131 of the rotor.
  • FIG. 9 illustrates an enlarged view of a longitudinal section of key parts of a driving unit in a drum type washing machine in accordance with another preferred embodiment of the present invention, identical to the foregoing embodiment except that the rotor 13 includes bonding pieces.
  • the rotor separate from the pass through hole 131 and the communication holes 137 in the rotor, the rotor includes bonding pieces 210, and 211 projected in a length direction of the washing shaft.
  • the direction of the projection may be a front direction or a rear direction in the length direction.
  • At least one bonding piece 210 is formed at the hub, and preferably at the pass through hole 131.
  • both of the bonding pieces 210, and 211 may or may not be formed.
  • the insert molding may be made such that the resin covers front and rear surfaces of neighborhood of the pass through hole of the hub of the rotor.
  • the direct drive motor in a washing machine of the present invention permits to provide a drum type washing machine having less noise, faults, and power loss, improve workability at the time of fabrication of the rotor, and reduce vibration from the rotor.
  • the rotor of steel plate enabling pressing with good processability to require a shorter fabrication time period permits to provide a drum type washing machine having an improved productivity
  • the connector having a vibration mode different from the rotor permits to reduce vibration from the rotor to the washing shaft, and the supporter supports and maintains concentricity of the stator, effectively.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

L'invention concerne, dans un de ses modes de réalisation, un moteur à entraînement direct conçu pour une machine à laver afin d'en améliorer la conception. Le courant s'écoulant vers le bas en direction de l'arbre est interrompu même si l'isolation entre la partie enroulement du stator et le rotor est coupée, dans le but d'empêcher des accidents provoqués par la négligence. A cet effet, le moteur à entraînement direct de la machine à laver comprend un stator (14) possédant une partie enroulement, un rotor (13) accouplé fixe à un arbre (4) de la machine afin d'entraîner directement le tambour, ce rotor (13) possédant une paroi latérale (13b) et une paroi arrière (13a) comportant un passage traversant (131) au niveau de son centre, ainsi qu'un raccord (16) dont le matériau possède un mode de vibration différent de celui de l'arbre, la pièce insérée moulée au centre de la paroi arrière (13a) du rotor étant solidaire du rotor et accouplée fixe à l'arbre de lavage, afin de créer une liaison entre eux et de supporter l'arbre de lavage.
PCT/KR2005/003764 2004-11-09 2005-11-08 Moteur a entrainement direct pour machine a laver WO2006052073A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05825777.5A EP1810387B1 (fr) 2004-11-09 2005-11-08 Moteur a entrainement direct pour machine a laver
US10/562,670 US7755228B2 (en) 2004-11-09 2005-11-08 Direct drive motor in washing machine
CN2005800457980A CN101443983B (zh) 2004-11-09 2005-11-08 用于洗衣机中的直接驱动电动机

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2004-0090810 2004-11-09
KR1020040090810A KR101100168B1 (ko) 2004-11-09 2004-11-09 세탁기의 직결식 모터
KR10-2004-0095071 2004-11-19
KR1020040095071A KR101100180B1 (ko) 2004-11-19 2004-11-19 직결식 세탁기의 모우터 구조

Publications (2)

Publication Number Publication Date
WO2006052073A2 true WO2006052073A2 (fr) 2006-05-18
WO2006052073A3 WO2006052073A3 (fr) 2009-05-14

Family

ID=36336897

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2005/003764 WO2006052073A2 (fr) 2004-11-09 2005-11-08 Moteur a entrainement direct pour machine a laver

Country Status (3)

Country Link
US (1) US7755228B2 (fr)
EP (1) EP1810387B1 (fr)
WO (1) WO2006052073A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9948152B2 (en) 2015-12-11 2018-04-17 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
US10693336B2 (en) 2017-06-02 2020-06-23 Whirlpool Corporation Winding configuration electric motor
US10704180B2 (en) 2016-09-22 2020-07-07 Whirlpool Corporation Reinforcing cap for a tub rear wall of an appliance

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KR101660729B1 (ko) * 2008-12-30 2016-09-29 엘지전자 주식회사 세탁장치
KR20100129156A (ko) 2009-05-28 2010-12-08 엘지전자 주식회사 세탁장치
KR20100129157A (ko) 2009-05-28 2010-12-08 엘지전자 주식회사 세탁장치
US8405268B2 (en) 2010-02-18 2013-03-26 Nidec Motor Corporation Stator with monolithic mounting bosses and assembly comprising the same
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US11750046B2 (en) 2021-03-18 2023-09-05 Whirlpool Corporation Electric motor for an appliance

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9948152B2 (en) 2015-12-11 2018-04-17 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
US10218233B2 (en) 2015-12-11 2019-02-26 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
US10326323B2 (en) 2015-12-11 2019-06-18 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
US10897167B2 (en) 2015-12-11 2021-01-19 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
US11374448B2 (en) 2015-12-11 2022-06-28 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
US11641138B2 (en) 2015-12-11 2023-05-02 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
US11909265B2 (en) 2015-12-11 2024-02-20 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
US10704180B2 (en) 2016-09-22 2020-07-07 Whirlpool Corporation Reinforcing cap for a tub rear wall of an appliance
US11473231B2 (en) 2016-09-22 2022-10-18 Whirlpool Corporation Reinforcing cap for a tub rear wall of an appliance
US10693336B2 (en) 2017-06-02 2020-06-23 Whirlpool Corporation Winding configuration electric motor
US11482901B2 (en) 2017-06-02 2022-10-25 Whirlpool Corporation Winding configuration electric motor

Also Published As

Publication number Publication date
WO2006052073A3 (fr) 2009-05-14
EP1810387A4 (fr) 2012-07-11
EP1810387A2 (fr) 2007-07-25
EP1810387B1 (fr) 2013-06-26
US20080067879A1 (en) 2008-03-20
US7755228B2 (en) 2010-07-13

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